Add documentation
Use named RSVP AMD module
Make `rake` build Oasis
Update RSVP in browser version
Fix other postMessage from sandbox

We noticed this because Chrome uses postMessage
to connect the debugger in iframes and our code
was exploding. However, this also removes
general postMessage pollution, allowing the
sandbox to do non-Oasis postMessaging.
Export internal RSVP as Oasis.RSVP